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JavaScript - check if string contains only digits
6 points
In this article, we would like to show you how to check if the string contains only digits in JavaScript.
Quick solution:
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let value = '123';2
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let result = /^\d+$/.test(value);4
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console.log(result); // true
In this example, we present how to check if the string contains only digits using regex.
Where:
\d- stands for "digit" and matches any digit character (0-9),^- matches the beginning of the string,+- matches one or more of the preceding token (in our case one or more\d),$- matches the end of the string.
Runnable example:
xxxxxxxxxx1
let number = '123';2
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let text1 = 'A12';4
let text2 = '1A2';5
let text3 = '12A';6
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let empty = '';8
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let result1 = /^\d+$/.test(number); // true11
let result2 = /^\d+$/.test(text1); // false12
let result3 = /^\d+$/.test(text2); // false13
let result4 = /^\d+$/.test(text3); // false14
let result5 = /^\d+$/.test(empty); // false15
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console.log(result1); // true17
console.log(result2); // false18
console.log(result3); // false19
console.log(result4); // false20
console.log(result5); // false